Change "Tasks" label

"Actions" is more relevant as compared to "Tasks".
The patch didn't work for Drupal 9.5.4. Contributing a patch here

As @samuel.mortenson already mentioned this is not going to change for now and he's not planning to commit it. Maybe it could be worth creating an extra input in the configuration form where each admin can put what they want (in another issue.

If anyone wants to change it, they can easy put a hook in their custom .module file:

/**
 * Implements hook_toolbar_alter().
 */
function mymodule_toolbar_alter(&$items) {
  // Changes the title of the 'Task' moderation sidebar tab.
  if (isset($items['moderation_sidebar'])) {
    $items['moderation_sidebar']['tab']['#title'] = t('Actions');
  }
}